| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [prep] a [noun sg] | 2960 |
|
| 2 | involved [prep] a [noun sg] | 404 |
|
| 3 | [was/were] involved [prep] a | 159 |
|
| 4 | [was/were] involved [prep] [noun sg] | 61 |
|
